from what i know is ...
e6 & 6.5 aka TME (titanium-TD05HRA) - 1.1-1.2 spikes to 1.3,
e7 - 1.2-1.3 spikes to 1.4,
e8 - 1.3-1.4 spikes to 1.5,
e8MR (titanium-TD05HRA) - 1.4-1.5 spikes to 1.6,
e9 (titanium cum magnesium-errr dis lupa le... to new for me) da same but danger around 1.5 bar and above coz shaft would or could putus ... leddi putus a few .. sad :(
just some info ... correct me if i'm worng ... hehehe ..
still trying to get mine up to 1.6 hahahaha .. watch out MR's and 9's kakakaka .. dun marah yah coz just day dreaming and trying oni .... ;)